JP3668812B2 - Medium digging machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In the present invention, a hollow pile is press-fitted into the preceding excavation hole while pre-excavating the ground with an auger screw inserted into the hollow pile, and a bulb is formed by injecting cement milk into the lower end of the hollow pile after press-fitting to a required depth. The present invention relates to an underground excavator used for building.
[0002]
[Prior art]
Conventionally, as this type of medium digging excavator, a sheave block is suspended by an elevating wire on a standing mast so that it can be raised and lowered freely, and a wire sheave for narrowing a pile is provided below the sheave block via a hydraulic cylinder for raising and lowering the drive unit. And an auger screw having a jet injection port for jetting a jet to the side at the lower part is connected to the output shaft of the drive unit. It is widely known that a pile cap is attached to the lower part of the pile through a hydraulic cylinder for pushing, and a hollow pile fitted to the auger screw is detachably connected to the pile cap. Using a conventional machine, the hollow pile is press-fitted with the weight of the drive unit etc. while excavating the ground with an auger screw. In a hard ground layer that is difficult to squeeze, take a reaction force with the wire for narrowing the pile and press the hollow pile with the pushing cylinder, and when it reaches the support layer, rotate the rotating auger screw from the jet outlet at the bottom. While spraying cement milk to the side, a soil cement bulb consisting of a mixture of cement and excavated earth and sand, which is appropriately extended from the bottom of the excavation hole to the inside of the hollow pile, is gradually raised by a hydraulic cylinder for raising and lowering the drive unit. A hollow-pile hollow pile construction method is being developed.
[0003]
However, in the above-mentioned conventional machine, since two sets of hydraulic cylinders having different uses are provided in the vertical direction, the entire upper structure such as the drive unit has a problem that it is long and heavy.
[0004]
[Problems to be solved by the invention]
According to the present invention, hollow pile press-fitting can be continued corresponding to each of a normal formation and a hard formation, and an auger screw for injecting cement milk in bulb formation can be moved up and down at a constant speed while avoiding an increase in the weight of the apparatus. It is an issue to improve.
[0005]
[Means for Solving the Problems]
As means for solving the above problems, the present invention provides:
A sheave block suspended by a lifting wire hanging from the upper end of the mast;
A rotary drive unit at the lower part of the sheave block, connected to the upper end of an auger screw having a cement milk injection port at the lower end part,
A drive unit holder below the rotation drive unit and having a seat for receiving and supporting the rotation drive unit and a means for receiving an upward reaction force;
A pile cap that is below the drive unit holder and is detachably connected to the upper end of the hollow pile fitted to the auger screw,
A push-in hydraulic cylinder connected at one end to the top surface of the pile cap;
Desorption device between the sheave block and the other end of the pushing hydraulic cylinder, Desorption device between the sheave block and the rotary drive unit, and Desorption device between the pushing hydraulic cylinder and the drive holder,
We propose a medium digging machine consisting of
[0006]
The "means for receiving the upward reaction force" provided in the drive unit holder in the present invention includes a sheave attached to the drive unit holder and a squeezing wire pulled out from the winch of the base machine and pulling it downward. A fluid cylinder ram attached to the part holder can be detachably locked to a locked metal fitting provided on the mast, and various other structures can be used.
[0007]
In addition, as the “desorption device”, a clamp type using a fluid cylinder, a solenoid, a manual power source, or the like as a power source, a wedge engaging / disengaging type, a lever engaging / disengaging type, and other various structures are used.
Embodiments of the present invention will be described below with reference to the drawings.
[0008]
【Example】
In FIG. 1, a wire (4) suspended from a top sheave block (3) of a mast (2) supported vertically at the front end of a baker (1) is formed into a horizontally long substantially box shape as shown in FIGS. A sheave holder (5) having a sheave block (6) installed at the center thereof is suspended and guide rails (7), (7) laid along the mast (2) along the longitudinal direction. Further, as shown in FIG. 3, a rotary drive unit (8), which is provided with a motor (10) and a reduction gear (11) in a vertically long case (9), slides below the sheave holder (5). It is slidably supported via the metal fittings (12), and is in the lower part of the drive unit (8), as shown in FIGS. Open the drive seat (14) in the center and open both ends on both sides The drive unit holder (13) provided with the vertical cylindrical covers (15) and (15) is similarly supported via the slide fittings (16) and (16), and further below the drive unit holder (13). The bottom of the box (18) is similarly supported via a slide fitting (19) with a pile cap (17) to which a hollow pile should be detachably connected to the lower surface. The rams (21) and (21) of the pushing hydraulic cylinders (20) and (20) are fixed to the left and right sides, respectively, and the cylinders (20) and (20) are attached to the cylindrical covers (15) and (15). 15) Stands vertically while being movably inserted into the cylinder (20), and the upper end portions of the cylinders (20) are attached to the sheave holder (5) and the cylindrical covers (15), (15), respectively. 2 ), (22) and (23), (23) are detachably connected, and the upper end of the drive unit (8) is detachable by the sheave holder (5) and the detaching devices (24), (24). It is connected to.
[0009]
The auger screw (25) has a cement milk jet injection port (a) for vertically injecting cement milk to the lower part of the excavation head (26) at the tip while passing through the cement milk flow passage in the hollow shaft. The upper end of the pile cap (17), the soil accumulation box (18), and the drive unit holder (13) penetrate through the rotary unit and move in the axial direction so as to be an output shaft of the drive unit (8). The hollow pile (27) is detachably connected to the pile cap (17) with the upper end thereof being rotatably and axially slidably fitted to the auger screw (25). is there.
[0010]
(28) is a squeeze wire sheave rotatably supported on the back surface of the drive unit holder (13) as shown in FIG. 2, and is a wire drawn from a winch installed in the base machine (1). Is multiplied.
[0011]
The structure of the desorption device (22) is as follows. First, a round bar shape in which annular locking grooves (30) and (31) are formed at appropriate intervals, as shown in FIG. 5 (b), at the upper ends of the pushing cylinders (20) and (20). The locking rods (29) are protruded so as to coincide with the axis.
[0012]
On the other hand, the sheave holder (5) passes through the vertical holes (32) and (32) into which the locking rods (29) and (29) are to be inserted. 4. A pair of guide pieces fixed to the upper surface of the holder (5) with a pair of left and right clamp plates (33) and (33 ') sandwiching the holes (32) as shown in FIG. (34) and (34) are supported so as to be slidable from side to side so that they can be attached to and separated from each other, and the pair of clamp plates (33) and (33 ′) are provided on the opposite sides thereof with the locking rod (29 Semi-circular clamping surfaces (35), (35 ') corresponding to the minimum diameter of the annular locking groove (30) of the above-mentioned annular clamping grooves (30). Extend the arms (36) (36), (36 ') (36') 6), (36 ') and (36), (36') between the opening and closing hydraulic cylinder (37), (37 end and its ram (38) in), are connected, respectively (38) tip. When the hydraulic cylinders (37) and (37) are driven to extend and contract synchronously, the pair of clamp plates (33) and (33 ′) are joined as shown in FIG. ') Can be attached within the upper locking groove (30) of the locking rod (29), and are separated as shown in FIG. ') Can be opened at a wide interval through which the locking rod (29) can pass.
[0013]
The desorption devices (23) and (23) have substantially the same structure as the desorption devices (22) and (22) in order to engage and disengage with the annular locking groove (31) below the locking rod (29). It is arranged on flanges (39), (39) formed at the upper ends of the cylindrical covers (15), (15). In this case, the desorption devices (22) and (22) are engaged with the engagement grooves (30) and (30) of the engagement rod, and the desorption devices (23) and (23) and the engagement grooves (31), ( 31) is in a positional relationship that can be locked simultaneously.
[0014]
The structure of the desorption device (24) is as follows. First, locking plates (40), (40) having a pair of locking notches (41), (41) on both sides as shown in FIG. ) Protrudes upward.
[0015]
On the other hand, the sheave holder (5) passes through the long holes (42) and (42) into which the locking plates (40) and (40) are inserted, and on the inner bottom surface of the sheave holder (5), FIG. 7 (a), a pair of guide pieces (44), (44) having a substantially H-shaped wedge plate (43) fixed to the inner bottom surface of the holder on one side of each of the long holes (42). The wedge plate (43) is supported by a pair of wedge pieces (45), (45) and the locking plate (40). A pair of locking notches (41), (41) with a gap between them so that they can bite into each other, and long holes (42) project parallel to each other toward the wings, and this H-shaped wedge plate (43) Project the arms (46) and (46) at the end of the wedge opposite to the wedge pieces (45) and (45). Each end of the engagement / disengagement hydraulic cylinder (47), (47) and its ram (48), (48) tip are connected between the arm (46), (46) and the inner wall surface of the holder (5). It is. When the hydraulic cylinders (47) and (47) are driven to extend and retract synchronously, the wedge plate (43) moves to the side of the elongated hole (42), and the locking plate (40) is locked as shown in FIG. It can be locked in the notches (41) and (41), and can move in the opposite direction to be detached from the locking plate (40) as shown in FIG.
[0016]
The operation of the above example will be described below together with the pile press-in operation. The detaching devices (22) and (22) are used as the locking grooves (30) and (30) of the locking rods (29) and (29), and the detaching devices (23) and (23) are used as the locking grooves of the locking rods. (31) and (31) are attached to each other, and the detaching devices (24) and (24) are respectively locked to the locking notches (41) of the locking plates (40) and (40). With the sheave holder (5), the drive unit holder (13), the pile cap (17) and the drive unit (8) integrated as in 1, 2, and 3, the motor (10) is started and the auger screw ( 25) is rotated to loosen the wire (4), and the excavation head (26) starts excavation into the ground. The hollow pile (27) receives the weight of the entire upper structure such as the soil accumulation box (18), the drive unit holder (13), the hydraulic cylinders (20), (20), the drive unit (8), etc. It is press-fitted into the hole. The excavated earth and sand is conveyed upward in the hollow pile (27) by the screw blades of the auger screw (25) and stored in the storage box (18).
[0017]
When the hollow pile press-in resistance increases due to the hard formation, etc., and the press-fit cannot be press-in with the weight of the superstructure, as shown in FIG. 8 (a), the desorption device (22), the locking rod (29) of (22), (29) is released, and then the drive unit holder (13), hydraulic pressure is pulled by the squeezing wire (49) pulled out from the winch of the base machine (1) and hung on the sheaves (28), (28). The hollow pile (27) is pulled downward through the cylinders (20), (20), the reservoir box (18), and the pile cap (17), and in this state, the push-in cylinders (20), (20) are driven to extend and contract. The hollow pile (27) is intermittently press-fitted by repeating the above.
[0018]
When reaching the support layer, the excavation head (26) further digs into the support layer appropriately, and then presses the lower end of the hollow pile (27) slightly into the preceding excavation hole in the support layer.
[0019]
In this state, the desorption devices (22) and (22) are locked to the locking rods (29) and (29) and the desorption devices (23) and (23) are locked as shown in FIG. The locking to the rods (29) and (29) and the locking of the detaching devices (24) and (24) to the locking plates (40) and (40) are respectively released, and then the sheave holder (5) by the wire (4). ) At a fixed position, with the hollow pile (27) separated from the pile cap (17), the auger screw (25) is rotated at a constant speed, and cement milk is measured from the jet injection port (a). The injecting hydraulic cylinders (20) and (20) are driven to reduce while injecting at a constant rate per time to raise the auger screw (25) at a constant low speed. As a result, the inner peripheral surface of the hole is expanded to approximately the same diameter by cement milk injected at a high pressure, and a constant amount of cement milk is always discharged at each stage of ascent of the auger screw (25). And the excavated sediment remaining in the hole is thoroughly stirred and mixed.
[0020]
If necessary, the auger screw (25) may be moved up and down 2-3 times by the expansion and contraction drive of the cylinders (20) and (20) to supplement the stirring and mixing. The obtained soil cement bulb is strong.
[0021]
As another embodiment, an example in which an injection port is provided at the lower end surface of the excavation head (26) and cement milk is injected from the injection port at a low pressure is also implemented.
[0022]
【The invention's effect】
According to the intermediate excavator of the present invention, by selectively engaging and disengaging the three kinds of desorption devices, the structure can be changed to a hollow pile press-in configuration corresponding to the normal formation and the hard formation, and the indentation hydraulic cylinder is It can also be changed to a configuration that can also be used as an auger screw lifting drive means, thereby causing the cement oil injection auger screw lifting and lowering of the cement milk injection in bulb construction without causing an increase in the size and weight of the device. Can be performed at a constant speed.
[Brief description of the drawings]
FIG. 1 is a side view of a medium digging excavator.
FIG. 2 is a partially cutaway enlarged side view of an upper structure such as a rotation drive unit.
3 is a cross-sectional view taken along line III-III in FIG.
FIG. 4 is an enlarged plan view of an upper structure.
5A is a partially omitted view of the clamp open state of FIG. 4;
(B) It is an enlarged front view of a locking rod part.
6 is an enlarged sectional view taken along line VI-VI in FIG. 3;
7 (a) is a partially omitted view of the wedge separation state of FIG. 6. FIG.
(B) It is an enlarged side view of a locking plate portion.
FIGS. 8A and 8B are schematic diagrams showing a state in which the structure is changed to an underground excavation structure in a hard formation.
(B) It is a basic diagram of the state changed into the structure of the cement milk injection in a support layer.
[Explanation of symbols]
2 Mast 4 Lifting wire 6 Sheave block 8 Rotation drive unit 13 Drive unit holder 14 Receiving seat 17 Pile cap 20 Pushing hydraulic cylinders 22, 23, 24 Desorption device 25 Auger screw 27 Hollow pile 28 Sheave for drawing wire

Claims (1)

A sheave block suspended by a lifting wire hanging from the upper end of the mast;
A rotary drive unit at the lower part of the sheave block, connected to the upper end of an auger screw having a cement milk injection port at the lower end part,
A drive unit holder below the rotation drive unit and having a seat for receiving and supporting the rotation drive unit and a means for receiving an upward reaction force;
A pile cap that is below the drive unit holder and is detachably connected to the upper end of the hollow pile fitted to the auger screw,
A push-in hydraulic cylinder connected at one end to the top surface of the pile cap;
Desorption device between the sheave block and the other end of the pushing hydraulic cylinder, Desorption device between the sheave block and the rotary drive unit, and Desorption device between the pushing hydraulic cylinder and the drive holder,
Medium digging machine consisting of

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